This is a reversible pattern that lies flat. On the one side, the little pyramids point upward; on the other they point downward. The fabric is flat, firm, and shapely, requiring little or no blocking.
Knitting Tutorial - Matress Stitch worked horizontally to join two pieces of knitting. The stitches are in contrasting color to show detail, but it might be fun to do this and add some embroidery for embellished seams on a sweater. from Knitting Daily